/Engine/Source/Runtime/Core/Public/Misc/MapErrors.h
Ambient sound actor's AudioComponent has a NULL SoundCue property!: This warning is caused when there is a AmbientSound actor with a NULL SoundCue property. This is a problem because the actor won't actually be playing any sounds. This can be fixed by first choosing a sound cue in the generic browser and then going to the actor's Property Window->Audio Category->Audio Component and setting the 'SoundCue' property.
static [FLazyName](API\Runtime\Core\UObject\FLazyName) SoundCueNull;